A fiber-optic voltage sensor based on the longitudinal Pockels effect in a Bi<sub>12</sub>TiO<sub>20</sub> crystal is described. The use of a special backreflecting prism as a phase-retarding element is shown to improve the sensitivity and temperature stability of the sensor. A comparison between the temperature properties of the glass backreflecting prism and that of a quarter-wave plate is derived. The sensor demonstrates temperature stability of ∓1.5% from −20 °C to 60 °C and sensitivity of 0.145% per 1 V<sub>rms</sub> at 850 nm without the use of an additional temperature control channel.
© 2000 Optical Society of America
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(230.2090) Optical devices : Electro-optical devices
(230.5440) Optical devices : Polarization-selective devices
(260.1440) Physical optics : Birefringence
Valery N. Filippov, Andrey N. Starodumov, Yuri O. Barmenkov, and Vadim V. Makarov, "Fiber-Optic Voltage Sensor Based on a Bi12TiO20 Crystal," Appl. Opt. 39, 1389-1393 (2000)